Exposure to wood dust has long been associated with a varieuding dermatitis, allergic respiratory effects, mucosal and nonallergic respiratory effects, and cancer. Contact with the irritantpounds in wood sap can cause dermatitis and other allergic reactions. The respiratory ude asthma, hypersensitivity pneumonitis, and chronic bronchitis. Both the skin and respiratory system can be sensitized to wood dust. When a worker bes sensitized to wood dust, he or she can suffer severe allergic reactions (such as asthma or dermatitis) after repeated exposure or exposure to lower concentrations of the dust. Othermon symptoms assocude skin and eye irritation nasal dryness and obstruction and prolonged colds. The OSHA permissible exposure limit for nuisance dust is 15 mg/m3 , total dust (5 mg/m3 , respirable fraction) 8 hour time weighted average. NIOSH has set a rmended ex... See full list on Wood dust is emitted at high velo by moving or spinning machineponents. The primary method of controlling wood dust is with local exhaust ventilation (LEV), which removes dust at or near its source (Fig. 31a&b). LEV systems can often be integrated with machine guards. Exhaust hoods should be located as close as possible to the emission source, either on the woodworking machinery itself or near to the machine. The local exhaust systems should have an efficient air cleavice. For LEV systems to provide maximum protection, they should be properly maintained. Check and clean ducts and dust collectors at regular intervals. Inspect ducts to ensure that they are not loose, broken, or damaged. Check the V-belts on the drive units of belt-driven exhaust fans for slippage or breakage. Make sure the duct velo is maintained at a minimum of 2,500 to 4,000 feet per minute to effectively remove light, dry saw dust, heavy wood chips, and green shavings, and to prevent these from p... See full list on Circular Saws Exhaust the saw through the bottom of the table. Provide LEV under the blade slot. To decrease the open area between the table and the lower hood, attach a strip of flexible material to the machinery that will cover this areeased dust control, add a local exhaust hood above the top of the saw blade. The hood should be integrated with the guard on the upper part of the blade. For further information on control of wood dust from circular and other kinds of table saws, please consult the NIOSH Hazard Controls HC10. Band Saws Provideease the collection are in diameter) in the table around the slot area. To collect wood dust from the saw teeth, place a suction nozzle above the table, at the rear of the saw blade. Jointers Place a hood underneath the machine head. Shapers Control each head with an open-faced hood, located on the table behind the head. For additional protecti... See full list on
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